The term 'เสียก่อน (sǐa gɔ̀n)' is often used in Thai language as a polite way of requesting someone to let you do something first or beforehand. It originates from the expression of 'losing first' which carries the nuance of respectfully requesting precedence because of some reason. Although it literally means 'losing first', 'เสียก่อน (sǐa gɔ̀n)' is used to politely say 'excuse me, I'll go first' or 'excuse me, I'll do this first'. It is typically used with action verbs.